Is it your body that is the wrong size? Or is it your jeans?

Using computer imaging of thousands of women, some jeans makers have resized their products to fit curvy hips and thick waists typical of many women today. And some Web sites now take your measurements or offer online quizzes to help shoppers find the jeans that fit them best.

Looking good in a pair of standard-size blue jeans is an unattainable goal for many women, reports The Atlantic magazine, which highlights the jean-fitting trend in its December issue. For instance, jeans that fit well at the hips may billow around the legs. Jeans that flatter a bottom may be too tight at the waist, creating the unsightly “muffin top.”

As a result, some garment makers have begun to offer jeans in various proportions and sizes. Joe’s Jeans offers a variety of proportions and leg shapes with catchy names like Cigarette, Honey and Rocker. Less intimidating are the styles offered by large-size clothing retailer Lane Bryant, which now offers three color-coded categories for its jeans. The yellow, red and blue codes correspond to different waist-hip ratios and are based on body scan studies of 14,000 plus-sized women. Lane Bryant offers a quick quiz to help you figure out whether your body is straight (yellow), moderately curvy (red) or curvy (blue).

For those who don’t want to be limited to one retailer, the magazine suggests www.zafu.com, which offers a more detailed quiz focusing on how your jeans normally fit. Do they gape at the waist or fit too tight? Are your thighs thick or slim? The site is essentially a search engine, and once you finish the quiz, it will cough up dozens of jean styles and brands that suit your body shape. Another option, www.myshape.com, helps users find clothing matched to their measurements and body shape.

Susan Ashdown, a professor of fiber science and apparel design at Cornell University, notes that while clothing sizes may be standardized, the human body comes in a variety of shapes. “There’s an incredible amount of variation, much more than we’re aware of,” Dr. Ashdown told the magazine. “When we see a clothed population, we don’t really see the range of shapes that are underneath that clothing. Thank goodness.”